Dynamo-electric machine.



J. F. CURTIS.

,DYNAMO ELECTRIC MACHINE.

APPLICATION FILED FEB. 19, 1914.

1,267,983. Patented May 28,191&.

2 SHEETS-SHEET 1.

mm ATTOR N EY WITNESSES: ENTO.

J. F. CURTIS.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED FEB. 19. I914.

1,267,983. Patented May 28,1918.

2 SHEETS-SHEET 2.

WITNESSES: NVENTOR M BY UNITED STATES PATENT oEEIcE.

JAMES F. CURTIS, OF PITCAIRN, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELEC- TRIO AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent. 4

Patented May-28, 1918.

To all whom it may concern.

Be it hiown that I, JAMEs F. Cunris, a citizen of the United States, anda resident of R. F. D. No. l, Pitcairn, in the county of Westmorelandand State of Pennsylvania, have invented a new and useful Improvement inDynamo-Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines, and it hasspecialreference to the ventilation thereof. I

The object of my invention is to provide simple and inexpensive meansfor produc- I the outer supportin ing particularly effective andreliable ventilation of certain types of dynamo-electric machines.

In the prior art, machines of the type in question have usually beenprovided with housings having auxiliary interior walls thatwere adaptedto form, together with walls, annular discharge chambers havingventilating outlets near the machine shafts. The rotatable member of amachine of the above-mentioned character customarily had attachedtheretosome form of necessarily small fan for drawing in air fromsuitable openings in the frame and for discharging the air, afterpassage through certain parts of the machine, through the annularchamber and the outlets in the housings. However, such a constructioninherently had rather low.

volumetric limitations, as will be understood by those skilled in theart. In consequence, the useful output of the machine has beenrestricted by reason of the operating temperatures obtained, since theadmissible vol- I ume of cooling air has been relatively low.

According to my invention, I provide means for permitting the passage ofan ample supply-of ventilating air, thereby increasing the workingcapacity of the machine without any overheating. In the frame of amachine embodying my invention, I provide a plurality of openings at,

different distances from the axis and a sectional annular diaphragm thatis capable of being readily assembled within the frame and is disposedto internally separate the. spaced openings, thereby being adapted toproperly direct the ventilating air through the machine. It will'beevident'that' a relatively large fan may be employed and that aplentiful volume of cooling air may be utilized.

In the accompanying drawings, Figure 1 is a sectional view of a portionof a dynamoelectric machine constructed in accordance with my invention,Fig. 2 is a view, in front elevation and to smaller scale, of theannular diaphragm employed in the machine shown in Fig. 1, and Fig. 3isia sectional view of a portion of a dynamo-electric machine,illustrating a modification of my invention.

.Referring to the drawing, the dynamoelectric machine, a portion ofwhich is shown, comprises a stator frame 1, a housing 2, a ventilatingdiaphragm 3, and a suitable rotor 4 having a plurality of fan blades eof the usual, or any appropriate type, that are suitably attachedthereto. it will be understood that some of the parts shown are old andfamiliar in the art, and it is therefore deemed necessary to describeonly those portions that are new and relevant to my invention.

The frame 1 is provided with one or ticular construction is notessential to my invention.

The housing 2 serves the usual purpose of closing the end openings inthe frame 1 and of supporting the bearings of the machine. It will benoted that the housing may be of simpler construction than in the priorart, inasmuch as the old thin interior wall, hereinbefo-re mentioned, ispreferably omitted.

The ventilating diaphragm 3 internally separates the inlets 5 from theoutlets 8 and comprises an annular band of sheet metal or other suitablematerial having two relatively offset annular portions 11 and 12 thatare disposed in substantially parallel relation and an inclinedconnecting portion 13. The outer annular portion 12 is preferablydisposed to enga e the flange 10 onthe same side thereof as outlets 8,and the inner annular portion 11 has its inner periphery disposed inproximity to the inner edges of the fan blades 4?. As the diaphragm 3 isof greater outside diameter than the end opening in the frame 1, it ispreferably constructed of a plurality of sectional portions 11, forconvenience in assembling. .A joining plate 25 is secured to eachportion 11' and the overlapping portions of the plates 25 and theadjacent sectional portions ll are provided with registering openings toreceive a suitable clamping memben'such as a bolt 1%, the head 15 ofwhich is preferably disposed within a suitable external recess 16 in theouter end-portion of the frame 1. A suitable spacing-member, here shownas a tube 18, is disposed around the bolt 1% intermediate the frameendportion and the portion 11 of the diaphragm 3, and a suitable nut 19engages the bolt on the opposite side of the portion 11, therebyclamping the dia phragm in the proper position against the flange 10.

Reference may now be had to Fig. 8, in which a modification of thestructure'illustrated in Fig.1 is shown. The frame 1 of thedynamo-electric machine is provided with ventilating inlets 20 that areequipped with suitable covers 21 and screens 7, and ventilating outlets22 that are preferably provided with screens '9. A positioning bolt 23for the cover 21 is secured to the frame intermediate the correspondinginlet and outlet, thereby permitting the unrestricted passage of coolingair.

In this form of myinvention, the internal frame flange 10 is so locatedwith respect to the fan blades d that a flat ventilating dia phragm 24may be employed, thereby decreasing the cost of construction. Thediaphragm is held in place against the flange 10 by the bolt 1% and thetube 18, as de scribed with reference to Fig. 1.

Assuming that, during operation, the parts occupy the relative positionsshown in Fig. l, the path of ventilating air in the machine shown is asfollows, and is indicated by arrows:

The revolving fan blades 4?, by reason of their location, force an amplevolume of heated air through the outlets 8 to the atmosphere. Ann. equalvolume of cool air is simultaneously drawn in through the inlets 5 and,since direct access to the outlets 8 is prevented by the diaphragm 3,the eir is forced to circulate through the heated parts of themachine'and back along the shaft of the rotor A to the fan blades i,whence it is expelled as above stated. The path of the ventilating airin the construction of 2 is mdicated by arrows also.

memes T do not wish to be restricted to the structural details andarrangement of parts herein set forth, as many modifications thereof maybe made within the spirit and scope of my invention. 1, therefore,desire that bnly' such limitations shall be imposed as are indicated inthe appended claims.

I claim as my invention:

1. lln a dynamic-electric machine, the combination with a frame having aplurality of openings in the end thereof comprising inlet and dischargeopenings for ventilating fluid, and a rotatable member provided with aplurality of fan blades, of an annular member of greater outsidediameter than the diameter of the largest of said openings, said membercomprising a plurality of assembled segmental pieces andbeing adapted tocause all of the ventilating fluid to flow through portions of saidrotatable member before reaching said discharge opening.

2. In a dynamo-electric machine,the combination with a frame having aplurality of ventilating openings, and a'rotatable member Provided witha plurality of fan blades for producing currents of air, of a sectionalannular diaphragm having one periphery engaging said frame intermediatesaid open-i ings and the other periphery located adja-t cent to said fanblades to separate the inlet openings from the discharge openings, aspacing member disposed between said frame and said diaphragm, and aclamping means associated with the spacing means for rigidly positioningsaid diaphragm and for so curing the sections thereof together.

3. In a dynamo-electric machinathe combination with a frame having aplurality of; ventilating openings and an internal annular projectionintermediate said openings, mo and a rotatable member provided with aplurality of fan blades for producing currents of air, of an annulardiaphragm having its outer periphery engaging said projection and itsinner periphery located adjacent to 1% said fan blades, a spacing memberdisposed between said frame and said diaphragm, a supporting memberdetachably associated with said frame and extending through said spacingmember and said diaphragm, and 31M clamping means adjustable on saidsupport ing member to rigidly position said diaphragm against saidprojection.

Tn testimony whereof, if have hereunto subscribed my name this 13th dayof Feb.

JAMES F. CURTIS. 'Witnesses:

Kari. l5. Emma,

B. B. Hanna.

